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    Basic support for Moschip 9900 family I/O chips · 7808edcd
    Nicos Gollan 提交于
    Add I/O based support for serial and parallel ports of the following
    chips:
    
    Vendor: Moschip (0x9710)
    
    Parts (device IDs)
    * 9900 (0x9900)
    * 9904 (0x9904
    * 9901 (0x9912, also sold as 9912)
    * 9922 (0x9922)
    
    On all chips but the 9900, a single port is provided per PCI subdevice
    (subvendor-ID 0xA000, subdevice-IDs 0x1000 for serial, 0x2000 for
    parallel with proper class codes). In cascading configurations, the
    9900 provides two devices per subdevice, with subvendor-ID 0xA000 and
    subdevice-IDs 0x30ps where p is the number of parallel ports and s the
    number of serial ports.
    
    Basic testing was only done on the serial part of a 9912 to the point
    where it can be used for a serial kernel console, and advanced features
    are completely untested. It is possible to reduce functionality of the
    chips by adding a configuration EEPROM, and the datasheet [1] is
    inconsistent w.r.t subdevices in the 4s+2s1p and 2s1p+4s
    configurations. The subdevice-ID 0x3012 should likely read 0x3011 with
    a serial port in function 3, which would be consistent with the BAR
    layouts. For now, the drivers ignore subdevices with ID 0x1000 and no
    class code.
    
    The parallel ports are integrated in parport_serial even for purely
    parallel parts to reduce the footprint of the patch.
    
    [1] http://www.moschip.com/data/products/MCS9900/MCS9900_Datasheet.pdfSigned-off-by: NNicos Gollan <gtdev@spearhead.de>
    Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
    7808edcd
parport_serial.c 14.5 KB